The explosion on June 30, 1908 was equivalent to 20 million tons of TNT.

The mysterious 1908 Tunguska explosion that leveled 830 square miles of Siberian forest. A dazzling light pierced the heavens, preceding a shock wave with the power of a thousand atomic bombs which flattened 80 million trees in a swathe of more than 2,000 square kilometers. Following the 1908 explosion, known as the Tunguska Event, the night skies shone brightly for several days across Europe, particularly Great Britain — more than 3,000 miles away. Evenki nomads recounted how the blast tossed homes and animals into the air. In Irkutsk, 1,500km away, seismic sensors registered what was initially deemed to be an earthquake. The fireball was so great that a day later, Londoners could read their newspapers under the night sky.

What caused the so-called Tunguska Event, named after the Podkamennaya Tunguska river near where it happened, has spawned at least a half a dozen theories.

“(I)f the Tunguska event was in fact caused by a comet, it would be a unique occurrence rather than an important case study of a known class of phenomena,” Gasperini’s team write in this month’s issue of Scientific American .

“On the other hand, if an asteroid did explode in the Siberian skies that June morning, why has no-one yet found fragments?”

Members of a special expedition researching the site of the famous Tunguska meteorite fall have claimed they had discovered parts of an extraterrestrial device. The expedition, organized by the Siberian Public State Foundation “Tunguska Space Phenomenon” completed its work on the scene of Tunguska meteorite fall on August 9. It was the first expedition to the region since 2000. The scientists claim that they found remains of an extraterrestrial technical device that allegedly had an accident in Siberia in 1908. According to the Moscow News, the first ever debris of the object that exploded over Tunguska, Russia in 1908 has been recovered. The article says that a large black, metallic box has been found and has been sent to a lab for analysis. They also say that they found the so called “deer stone” – an artifact repeatedly mentioned in the reports of the eyewitnesses of the Tunguska phenomenon. A part of the “deer stone” has been delivered to Krasnoyarsk for research.

BEIJING, Aug.12 (Xinhuanet) — Russian scientists said they have discovered the wreck of an alien device at the site of an unexplained explosion in Siberia almost a hundred years ago, China Daily reported today, citing the Interfax news agency as the source.

An expedition of Russian researchers claims to have found evidence that an alien spaceship had something to do with a huge explosion over Siberia in 1908. Other news reports told of a “technical device” and “a large block made with metal.” The researchers were said to chip a piece off for laboratory study.

Expedition members to find a buried object covered with trees.

The object appeared to be a large block made with metal. The researchers chipped a piece of the object and will now test its composition.

The scientists, who belong to the Tunguska space phenomenon public state fund, said they found the remains of an extra-terrestrial device that allegedly crashed near the Tunguska river in Siberia in 1908.

Their findings also include a 50-kilogram (110-pound) rock which they have sent to the Siberian city of Krasnoyarsk for analysis.

The Tunguska blast, in a desolate part of Siberia, remains one of the 20th century’s biggest scientific mysteries.

On June 30, 1908, what is widely believed to be a meteorite exploded a few kilometers above the Tunguska river, in a blast that was felt hundreds of kilometers (miles) away and devastated over 2,000 square kilometers of Siberian forest.

Over a number of years members of the Tunguska Cosmic Phenomenon Siberian Fund carried out a thorough analysis of the reports of eyewitnesses of the 1908 catastrophe.

Some eyewitnesses assert that one body looked like a “tube”. It was cylindrical and irradiated a white bluish light.

Spectral analysis of the soil, water and trees in this area revealed anomalous presence of a number of elements, including some of extra-terrestrial origin in all the media. Tree cut cross sections from these areas testify to some unknown X-radiation

Artifacts With Extraterrestrial Writings Discovered Near Tunguska Site

Scientists from the Siberian city of Krasnoyarsk claim that they have discovered several artifacts with extraterrestrial writings near the fall site of the Tunguska meteorite, the Regnum news agency reports. The president of the Tunguska Space Phenomenon research foundation told reporters that several quartz boulders with mysterious writings on them were found in the Tunguska river basin in 2006. The boulders were tested in Krasnoyarsk and Moscow and test results speak for the fact that they are of extraterrestrial origin, he said.

The boulders were covered in strange signs of artificial origin, presumably made with plasma. Scientists from the Siberian city of Krasnoyarsk claim that they have discovered several artifacts with extraterrestrial writings near the fall site of the Tunguska meteorite, the Regnum news agency reports. The president of the Tunguska Space Phenomenon research foundation told reporters that several quartz boulders with mysterious writings on them were found in the Tunguska river basin in 2006. The boulders were tested in Krasnoyarsk and Moscow and test results speak for the fact that they are of extraterrestrial origin, he said. The boulders were covered in strange signs of artificial origin. Russian researchers suggested a hypothesis that the quartz tablets were parts of an information container delivered to Earth by the extraterrestrial spaceship that crashed in Tunguska region in 1908.

To add to the mystery RUSSIAN police are combing the northern Siberian city of Krasnoyarsk for a three-tonne meteorite that has disappeared from under the nose of its keepers. The giant rock was stolen from the yard of the Tunguska Space Event foundation, whose director said it was the part of meteor that caused a massive explosion in Siberia in 1908, news agency Interfax reported. Foundation director Yury Lavbin brought the three-tonne rock to Krasnoyarsk after an 2004 expedition to the site of the so-called “Tunguska event” – a mysterious mid-air explosion in Siberia in 1908 that was 1,000 times more powerful than the nuclear bomb dropped on Hiroshima in 1945.

Mr Lavbin claimed at the time to have discovered the wreckage of an alien spacecraft during the expedition.